<div class="ant-back-top" (click)="clickBackTop()" [@enterLeave] *ngIf="visible">
  <ng-template #defaultContent>
    <div class="ant-back-top-content">
      <div class="ant-back-top-icon"></div>
    </div>
  </ng-template>
  <ng-template [ngTemplateOutlet]="nzTemplate || defaultContent"></ng-template>
</div>